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Cleanroom Air Distribution Systems
Cleanroom Return Air Grille
A low-wall return grille with fixed horizontal aluminum blades and a removable cleanable core for drawing room air back to the recirculation system.
- Low-Wall Return Capture
- Fixed Horizontal Blades
- Removable Cleanable Core
- Optional Washable Prefilter
Product Introduction
The cleanroom return air grille collects room air at low level to support top-down clean-air movement and the designed room pressure cascade. Closely spaced extruded aluminum blades obscure the duct interior while maintaining an open return path with modest pressure drop. The complete blade core releases from the perimeter frame for cleaning and optional prefilter replacement. A concealed gasket seals the frame to a sandwich-panel or masonry opening so air does not bypass through the wall cavity.
Key Features
Fixed zero- or low-deflection blades provide a repeatable free area without user adjustment.
The hinged or lift-out core exposes the rear duct and optional filter without removing the embedded wall frame.
Extruded aluminum blades combine a rigid slim profile with a smooth washable finish.
Customer Product Concerns
A return grille must capture air with low resistance, remain accessible near the floor and prevent the wall opening from becoming a hidden contamination point.
Air short-circuits near the ceiling instead of sweeping particles toward low-level returns.Low-wall grille placement reinforces the intended downward circulation path from ceiling supply to room return.
Lint accumulates behind fixed blades close to the floor.A removable core opens the entire rear surface for vacuuming and wipe-down.
Wall-cavity leakage reduces the measured return volume from the room.A continuous perimeter gasket and rear sleeve connect the grille directly to the sealed return duct.
A dense filter creates excessive pressure drop at the return opening.A coarse washable prefilter option captures visible debris while preserving the grille's large free area.
Typical Applications
Low-level return in pharmaceutical cleanroomsRecirculation walls in electronics facilitiesMedical-device clean assembly roomsLaboratory pressure-controlled zonesGowning-room return-air branches
Technical Parameters
Typical construction ranges for a cleanroom low-wall return air grille are shown below.
| Core Material | Extruded aluminum frame and fixed aerofoil blades with optional stainless mesh prefilter |
|---|---|
| Panel Thickness | 1.2–2.0 mm aluminum blade and frame extrusion walls |
| Effective Width | 200–1200 mm nominal grille width |
| Maximum Length | Up to 2000 mm as a single grille section |
| Steel Facing Thickness | 0.5–0.8 mm optional stainless-steel rear filter mesh |
| Core Density | Approximately 2700 kg/m³ for the aluminum frame and blade core |
| Thermal Conductivity | Approximately 200–210 W/(m·K) for the aluminum frame and blade core |
| Surface Finish | White epoxy-polyester powder coat, clear anodized aluminum or brushed finish |
| Joint Type | Hinged or lift-out blade core in a gasketed wall frame with rear duct sleeve |
| Customization | Available based on the intended application and operating environment. |
Available Options
Fixed horizontal or vertical blade orientationWashable stainless mesh prefilterHinged core with concealed latchesSandwich-panel sleeve and opposite flange
Planning a Cleanroom Return Air Grille specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
